Fast Analysis Method of Steady-State Performance in Synchronous Reluctance Motor With Damping Bars

The synchronous reluctance motor with damping bars, commonly known as the line-start synchronous reluctance motor (LS-SynRM), has attracted considerable attention as a high-efficiency motor. However, analyzing the LS-SynRM requires accounting for both electromagnetic and mechanical transients using finite element analysis (FEA) due to its starting characteristics. This process is time-consuming, particularly when evaluating steady-state performance. In this article, a fast analysis method for steady-state performance is proposed, integrating a mathematical model with magnetostatic FEA. The steady-state current vector is analyzed using the mathematical model and stability analysis. This current vector is derived from the dq-axis inductance, which exhibits nonlinear behavior. To address this nonlinearity, motor parameters are calculated through magnetostatic FEA. Using the motor parameters and the mathematical model, an iterative algorithm is proposed to determine the current vector. This algorithm ensures the unique determination of the current vector. The proposed method is validated by comparing the steady-state performance via conventional method. The computation time of the proposed method can be reduced approximately 14 times compared with the conventional method. Finally, a 2.2 kW, 380 V, 4-pole, three-phase LS-SynRM is manufactured and tested to verify the proposed method. Experimental results further validate the accuracy and computational efficiency of the proposed method.